diff --git a/ethosu/regor/tflite/flatbuffer_utils.hpp b/ethosu/regor/tflite/flatbuffer_utils.hpp
index 796e03ccbaa03a365f8107f6e560c25fdf9fc84e..21d864a9cfa7515d451b8a2d3607d30e296c1ac0 100644
--- a/ethosu/regor/tflite/flatbuffer_utils.hpp
+++ b/ethosu/regor/tflite/flatbuffer_utils.hpp
@@ -21,6 +21,7 @@
 #include "common/logging.hpp"
 
 #include <flatbuffers/flatbuffers.h>
+#include <unordered_map>
 
 namespace FlatbufferUtils
 {